(a) LESSEE SHALL NOT SELL, TRANSFER, ASSIGN OR ENCUMBER THE AIRCRAFT, ANY ENGINE OR ANY PART
THEREOF, LESSOR’S TITLE OR ITS RIGHTS UNDER THIS LEASE, EXCEPT AS OTHERWISE EXPRESSLY PERMITTED
HEREIN. LESSEE SHALL NOT, WITHOUT THE PRIOR WRITTEN CONSENT OF LESSOR, SUBLET, CHARTER OR PART
WITH POSSESSION OF THE AIRCRAFT OR ANY ENGINE OR PART THEREOF OR ENTER INTO ANY INTERCHANGE
AGREEMENT EXCEPT AS OTHERWISE PERMITTED HEREIN. Lessee shall keep the Aircraft, each engine and
any part thereof free and clear of all liens and encumbrances other than those which result from
(i) the respective rights of Lessor and Lessee as herein provided; (ii) liens arising from the acts
of Lessor or its agents; (iii) liens for taxes not yet due or being reasonably disputed in good
faith so long as Lessee delivers collateral to Lessor in an amount satisfactory to Lessor and such
amount does not result in any imminent risk of loss or forfeiture of the Aircraft or any civil or
criminal liability on Lessor; and (iv) materialmen’s, mechanics’, workmen’s, repairmen’s,
employees’ or other like liens (whether inchoate or not) arising in the ordinary course of business
of Lessee for sums not yet delinquent or being contested in good faith (and for the payment of
which adequate assurances in Lessor’s judgment have been provided Lessor).

     Notwithstanding the foregoing, so long as Lessee is not in default hereunder, Lessee may
charter the Aircraft so long as: